Substitution Functional Group:-O-CH2-CH2-OHTentaGel® resins are constructed with a backbone of low crosslinked polystyrene grafted with polyoxyethylene (polyethylene glycol) as shown below.; The typical chain length of POE (n) is approximately 68 ethylene oxide units or an average MW of 3000. This long chain creates a spacer that effectively separates the reactive site (X) from the crosslinked backbone matrix.; TentaGel® HL (High Load) (mean particle size 75 µm: capacity 04-06 meq/g)